J. Mater. Sci. Technol. ›› 1998, Vol. 14 ›› Issue (3): 205-210.
Zhenfu DONG and Lianmao PENG(Beijing Lab. of Electron Microscopy, Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences, P.O.Box 2724, Beijing 100080, China)Ke LU and Zhuangqi HU(State Key Lab. for RSA, Institute of Meta
Zhenfu DONG and Lianmao PENG(Beijing Lab. of Electron Microscopy, Institute of Physics and Center for Condensed Matter Physics,Chinese Academy of Sciences, P.O.Box 2724, Beijing 100080, China)Ke LU and Zhuangqi HU(State Key Lab. for RSA, Institute of Meta
摘要: 1-IntroductionAnanocrystalline(nc)[']materialisusuallyther-modynamicallymetastableduetothelargeamountoffreeenergystoredinit,e.g.initsgrainbound-aries.Thesituationisespeciallysowhenanon-equilibriumprocessisutilizedinthepreparationofthematerial,thisisbecauseintheprocesstheenergyisdirectlyintroducedintothemat.ri.ll2].Whenther-maJlyactivated,thencmaterialwillthereforetrans-formtowardsamorestables....